Utf8Mb4Sanitizer.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Mail\Transformation;
 
use ilDBConstants;
use ILIAS\Refinery\ConstraintViolationException;
use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\Transformation;
 
class Utf8Mb4Sanitizer implements Transformation
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;
 
    public function transform($from): string
    {
        if (!\is_string($from)) {
            throw new ConstraintViolationException(
                'Value to be transformed must be of type string',
                'not_string'
            );
        }
 
        return preg_replace(
            '/[\x{10000}-\x{10FFFF}]/u',
            ilDBConstants::MB4_REPLACEMENT,
            $from
        );
    }
}